LSU Dual rotor flowmeter-[Quotation-data]--Shanghai Huabang Industrial Business-www.91way.com

Product name：

LSU Dual rotor flowmeter

specification：

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Category：

instrumentation and meters -- rotameter

Price：

factory price

Brand：

Shanghai

Place of Origin：

China

Available Quantity：

batch

delivery cycle：

Spot goods (or inquire by telephone)

Shanghai Beiyuan Industry and Trade Co.,Ltd
+86-21-66770508
+86-13901609058

91way@163.com
13901609058(Wechat)

LSU Dual rotor flowmeterDetailed product description：

LSU dual rotor flowmeter (hereinafter referred to as flowmeter) is a new generation of volumetric flowmeter, also known as UF - ∥ flowmeter or screw flowmeter. It is a precision instrument used for measuring and controlling liquid flow in pipelines. Widely used in departments such as petroleum, chemical, metallurgical, electric power, transportation, ships, oil depots, docks, tank trucks, etc., it is particularly suitable for measuring flow meters for industrial liquids such as crude oil, refined oil, and light hydrocarbons. The flow meters can indicate on site, read the code directly, and can be distributed with a communicator, output electrical pulse signals, and transmit them remotely to secondary instruments or computers to form automatic control, automatic detection, and data processing systems.

working principle
The spiral rotors of the flowmeter have a pair of special teeth that mesh directly without relative sliding and do not require synchronous gears. Drive the rotor to rotate by the small pressure difference at the inlet and outlet. The following diagram represents a cross-section of a pair of rotors during operation. At the same time, although each rotor experiences different rotational torques from the fluid on the same cross-section, the combined torque of the rotational torques experienced by the two rotors on all cross-sections is equal. Therefore, both rotors rotate at a constant speed and equal torque, with balanced displacement and no pulsation. The spiral rotor can output 8 times the volume of the cavity per revolution, therefore, the rotational speed of the rotor is proportional to the cumulative flow rate of the fluid, and the rotational speed of the rotor is proportional to the instantaneous flow rate of the fluid. The rotational speed of the rotor is transmitted to the meter counter through a magnetic coupling, displaying the flow rate through the flowmeter (flowing through the pipeline).

Technical parameters of LSU dual rotor flowmeter

Nominal diameter (mm)	40, 50, 80, 100, 150, 200, 250, 300
Basic error (%)	± 0.2, ± 0.3, ± 0.5
Repetitive error (%)	0.07 (± 0.2%, ± 0.3%), 0.17 (± 0.5%)
Allowable working pressure (MPa)	1.6, 2.5, 4.0, 6.4
Temperature of the tested medium (℃)	-20~+80, -20~+120, -20~+150,+100~+200
Viscosity of the measured medium (mPa. s)	0.6～200
Explosion-proof rating	D ∥ BT4 (Electric pulse signal remote flowmeter is divided into ordinary and explosion-proof types)
Pipeline flange standard	GB9122—1988 GB9113—1988 JB79—59 JB82—59
Main material of flowmeter	Stainless steel, cast steel, cast iron, gasoline medium stainless steel bearings
Distance of remote signal transmission (m)	<1000
Remote signal frequency (Hz)	0~1000
Remote signal amplitude (V)	>5

Basic error curve and pressure loss curve

Crude oil 23-24 mPa. s
Kerosene 1.5mPa. s
Gasoline 0.7mPa. s

Specifications and Flow Range
± 0.2% (and ± 0.3%) flow meter

Nominal Diameter (mm)	Flow range (m)^three/h）
Nominal Diameter (mm)	0.6～2mPa.s	2～8mPa.s	8～200mPa.s
forty	5.5～22	4.8～24	3~24
fifty	9~36	8~40	5~40
eighty	22.5～90	18~90	11.2～90
one hundred	34~135	30~150	19~150
one hundred and fifty	56~225	50~250	31~250
two hundred	85~342	76~380	48~380
two hundred and fifty	135~540	120~600	75~600
three hundred	180~720

± 0.5% flowmeter

Nominal Diameter (mm)	Flow range (m)^three/h）
Nominal Diameter (mm)	0.6～2mPa.s	2～8mPa.s	8～200mPa.s
forty	3.6～22	2.4～24	1.6～24
fifty	6~36	4~40	2.8～40
eighty	15~90	10~100	6.8～100
one hundred	23~135	15~150	10~150
one hundred and fifty	38~225	25~250	16~250
two hundred	57~342	38~380	25~380
two hundred and fifty	90~540	60~600	40~600
three hundred	120~720	80~800	53~800

Dimensions and weight of flowmeter

nominal path (mm)	Weight (kg)		Dimensions (mm)
	Weight (kg)		flow meter				filter
	flow meter	filter	L	A	H	B	L	A	H	B
forty	thirty-two	fourteen	two hundred and eighty-five	Ф180	four hundred and three	one hundred and sixteen	two hundred and thirty	Ф140	two hundred and fifty-two	one hundred and thirty-five
fifty	sixty-eight	fifty	three hundred and sixty	Ф250	four hundred and ninety-two	one hundred and eighty-two	three hundred and eighty-two	Ф250	four hundred and thirty-seven	two hundred and sixty
eighty	eighty-two	fifty	four hundred	Ф280	five hundred and twenty	one hundred and eighty	three hundred and eighty-two	Ф250	four hundred and thirty	two hundred and thirty-six
one hundred	one hundred and twenty-eight	one hundred and eight	four hundred and forty	Ф324	five hundred and sixty-six	two hundred and twenty	four hundred and sixty-four	Ф286	five hundred and fifty	two hundred and eighty-two
one hundred and fifty	one hundred and seventy-four	one hundred and sixty-eight	five hundred and sixty	Ф410	eight hundred and twenty	three hundred and forty	six hundred and fifty	Ф380	eight hundred and fifteen	five hundred and thirty-five
two hundred	two hundred and fourteen	two hundred and six	seven hundred	Ф480	one thousand	four hundred	eight hundred	Ф460	one thousand	six hundred and fifty-eight

The advantages of LSU dual rotor flowmeter (compared with other flowmeters)

NO.	project	LSU dual rotor flowmeter	Other flow meters (Roots flow meter waist wheel flow meter, elliptical gear flow meter)
one	Volume advantage (including external dimensions, volume, weight, and construction)	1. Single structure, simple construction. two Compared to the dual body structure, it has a smaller volume and lighter weight.	Compared to monomers, the structure is more complex. two Compared to single flow meters of the same capacity, it has a larger volume.
two	performance advantage 1. The force exerted by the rotor	The rotor rotates at a constant speed without pulsation, and there is no mutual force between the rotors, with zero tooth surface force.	The inherent torque of the rotor varies greatly depending on the meshing position. Therefore, there is tooth surface force in the interaction between rotors.
	2. Internal traffic	Because it is a monolithic structure, and the discharge flow rate of each rotor is quantitative, which means the flow rate is uniform and without pulsation.	Due to the presence of multiple measuring chambers, the discharge flow rates of each rotor are inconsistent. When the fluids are merged, the flow rate appears relatively stable, but in fact, there are inevitable pulsations between the fluids.
	3. Gap area	Because it is a monolithic structure, there are two top gaps and two side gaps. Therefore, the impact on accuracy is very small.	The dual body flowmeter has two top clearances and four side clearances, with a large gap area that greatly affects accuracy. The biggest problem is poor repeatability, and there are also gaps in the meshing part of the rotor.
	4. Pressure loss	The structure is simple, resulting in low pressure loss, high reliability, and long lifespan.	The structure is complex, resulting in significant pressure loss, poor reliability, and short lifespan.
three	Noise (same level product)	Low noise. Example: Below 70dB	The noise is loud. Example: Above 80Db
four	vibration	Low vibration. Example: 7u (up and down amplitude)	Large vibration. Example: 30u up and down amplitude)
five	synchronizing gear	Adopting a spiral rotor, the meshing ratio is as high as 2 or more, and theoretically, the tooth surface force is zero as mentioned above. Without the need for synchronous gears, it is driven by the motion of the rotor itself, making it simple to construct and easy to maintain.	Due to the meshing ratio of the rotor being below 1, it cannot be transmitted by itself, so it must be transmitted through synchronous gears. This has also caused problems such as complex construction and difficult maintenance.
six	maintenance and repair	Simple to construct, compact, lightweight, and easy to maintain.	Complex construction, large size, and heavy weight. Compared to monolithic systems, maintenance and labor costs are higher.
seven	Accuracy characteristics	Maintain high precision for a long time and achieve high precision even at low flow rates, with a general factory precision of 0.2 level.	Maintaining high precision for a short period of time, it is difficult to guarantee low flow accuracy. When leaving the factory, the selected accuracy can reach up to 0.2 level.
eight	Large traffic range	Compared with other types of volumetric flow meters of the same caliber, the flow rate is 30-40% higher.	The flow range is relatively small.
nine	Sending characteristics	Accurate and reliable transmission, uniform instantaneous flow, high transmission frequency, easy to ensure accuracy.	The transmitter sends an average signal, and there is a large error in instantaneous flow rate changes.

LSU Dual rotor flowmeter（schematic diagram）